We already know that Mercedes-Benz is bringing a new show car to the Pebble Beach Concours d’Elegance. We also know that it’s called the Aesthetics Progressive Luxury Concept and its in-house name — Electric Silver Arrow — suggests that it’s connected to the automaker’s newly created EQ electric brand. Everything else, though, is still a mystery, and Merc’s latest teaser of the car doesn’t show anything revealing other than confirming speculation that the concept will be heavily based on Mercedes’ 1930’s racing design.